Accurate Open/Close Monitoring & AAA Battery Powered: The sensor requires a Zigbee hub to operate. You can monitor door or window open/close status via App and receive instant phone alerts. Powered by replaceable AAA batteries for long-lasting, stable performance. Tamper Alert & Instant Phone Notification: Built-in tamper-prevent button allows you to receive real-time phone alerts when the device is removed, enhancing door security. Smart Automation for Home Security and more: The sensor requires a Zigbee hub to operate. When the open/close/tamper status changes, it can trigger smart scenes such as alarms when open, camera recording, smart lights on, or voice notifications. Perfect for home security, child safety, pet monitoring, and energy-saving automation. Versatile Installation to Fit Most Doors & Windows: Supports horizontal and vertical magnet installation with up to 30mm detection distance. Ideal for wide door gaps, narrow door frames, apartments, garages, and office security setups. Compatible with other Zigbee Ecosystems: Easily integrates with Home Assistant via SONOFF Zigbee Dongles and works with Alexa and SmartThings through compatible Zigbee hubs.